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A tradition of excellence TR-824 REV / Restricted Proprietary Information. Marvin Group proprietary rights are included in the information disclosed herein. Recipient by accepting this document agrees that neither this document, nor the information disclosed herein, nor any part thereof shall be reproduced or transferred to other documents or used or disclosed to others for manufacturing or for any other purpose except as specifically authorized by Marvin Engineering. The 5 Whys: A Practical Example January 21, 2014